KR101522204B1 - Automatic frequency line tracking method at narrowband analysis - Google Patents

Automatic frequency line tracking method at narrowband analysis Download PDF

Info

Publication number
KR101522204B1
KR101522204B1 KR1020130165738A KR20130165738A KR101522204B1 KR 101522204 B1 KR101522204 B1 KR 101522204B1 KR 1020130165738 A KR1020130165738 A KR 1020130165738A KR 20130165738 A KR20130165738 A KR 20130165738A KR 101522204 B1 KR101522204 B1 KR 101522204B1
Authority
KR
South Korea
Prior art keywords
frequency
tracking
analysis
frequency line
maximum value
Prior art date
Application number
KR1020130165738A
Other languages
Korean (ko)
Inventor
최재용
서익수
김성원
Original Assignee
국방과학연구소
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 국방과학연구소 filed Critical 국방과학연구소
Priority to KR1020130165738A priority Critical patent/KR101522204B1/en
Application granted granted Critical
Publication of KR101522204B1 publication Critical patent/KR101522204B1/en

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/66—Sonar tracking systems

Abstract

The present invention relates to an automatic frequency line tracking method for specific signals obtained through a narrowband analysis acquired in a sonar(sensor) comprising stages of: setting a tracking frequency of a target signal measured in a sensor and detecting maximum value of a signal spectrum within a window cell range centering on the preset tracking frequency; algebraic converting neighboring frequency values including the detected maximum value; determining the adequacy of frequency line tracking of the algebraic converted data; interpolating data which passed the adequacy of frequency line tracking; providing again with the tracking frequency by detecting a frequency corresponding to the maximum value of the interpolated data; and executing tracking linkage for securing continuity of frequency line tracking at the conversion of mutual screen between a low frequency analysis for automatic frequency line tracking and an extended low frequency analysis at a narrowband analysis.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of automatically tracking a frequency line in narrowband analysis,

The present invention relates to a method for automatically tracking frequency line information of a specific signal obtained through narrowband frequency analysis on a signal obtained from a sonar (sensor).

Broadband analysis, narrowband analysis and instantaneous noise analysis are performed to extract necessary information from the signals obtained from various sonar (sensors) mounted on the platform. Narrowband analysis can obtain the operating status and operation information of certain equipment (machinery, propeller, etc.) through analyzed frequency information.

The operation information of the above equipment needs to be continuously monitored according to the purpose of the user. In particular, in order to easily determine external noises in a specific sonar for detecting / tracking external noises, it is necessary to monitor the self noise information of the platform and provide it to a specific sonar. For this purpose, it is required to continuously track the platform's own noise frequency in narrowband analysis.

Accordingly, an object of the present invention is to provide a method of automatically tracking a frequency line of a specific signal obtained through a narrowband frequency analysis on a signal obtained from a sonar (sensor).

It is another object of the present invention to provide a method of automatically tracking a frequency line capable of maintaining tracking continuity of a frequency line according to narrowband analysis conditions.

According to another aspect of the present invention, there is provided a method for automatically tracking a frequency line in a narrowband analysis, the method comprising: setting a tracking frequency of a target signal measured by a sensor, Detecting a maximum value of the spectrum; Converting the peripheral frequency values including the detected maximum value into logarithmic conversion; Determining the validity of the frequency line tracking for the logarithmically transformed data; Interpolating data that passes the frequency line tracking feasibility; And detecting a frequency corresponding to a maximum value of the interpolated data and providing the detected frequency again to the tracking frequency.

The step of determining the frequency line tracking validity may include comparing the detected maximum value to noise + 3 dB; Calculating a tracking feasibility value by assigning 1 if the detected maximum value is greater than or equal to noise + 3 dB; Repeating the above operations for the maximum number of detection times to accumulate tracking validity values; And if the accumulated tracking validity value is greater than a predetermined value, considering that the logarithmically transformed data has passed the frequency line tracking validity.

The weight value has a larger value as the maximum value detection count increases.

The interpolation performs a parabolic interpolation on the two spectral values on both sides about the maximum value.

The automatic frequency line tracking method in the narrowband analysis includes performing tracking linkage for ensuring frequency line tracking continuity at the time of mutual screen switching between a loaf analysis for automatic frequency line tracking and an extended loop analysis in narrowband analysis .

The present invention automatically tracks a frequency line of a signal obtained through a narrowband frequency analysis for a noise (signal) obtained from a sonar (sensor) and maintains tracking continuity of the frequency line according to a narrowband analysis condition, Monitoring is facilitated.

The tracked sonic noise frequency line information traced through the present invention provides basic information that can easily determine whether a signal detected in a specific sonar for detecting / tracking external noise is an external noise or an audible noise, It is possible.

1 is a flow chart of a method for automatic tracking of a frequency line in a narrowband analysis.
FIG. 2 is an exemplary diagram showing a tracking method according to an analysis frequency band conversion in an Overview Analysis; FIG.
FIG. 3 is an exemplary view showing a tracking method according to switching of an analysis frequency band in magnifier analysis. FIG.
FIG. 4 is an exemplary view showing a tracking method according to mutual conversion between Overview Analysis and Magnifier Analysis. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

Figure 1 is a flow chart of a method 100 for automatic tracking of frequency lines in narrowband analysis.

Referring to FIG. 1, in a narrowband analysis according to an exemplary embodiment of the present invention, a method for automatically tracking a frequency line 100 may include a frequency setting for tracking a narrowband signal of a signal measured from a sonar (sensor) Detecting (101) the maximum value of the spectrum within the window cell range centered on the frequency; Logarithmically transforming surrounding values including a maximum value of the detected spectrum (102); Determining (103) a tracking validity of a frequency line with respect to the logarithmically transformed maximum value; Performing interpolation (104) on data that has passed the tracking validity of the frequency line; Detecting (105) a frequency corresponding to a maximum value for the interpolated data and providing the frequency as a maximum value of the step (101); And tracking linkage to ensure continuity of the frequency line tracing according to mutual screen switching between the narrow-band analysis LOFAR analysis and the magnifier LOFAR analysis (Vernier LOFAR analysis, Magnifier LOFAR analysis) .

Hereinafter, a method of automatically tracking a frequency line of a specific signal obtained through narrowband frequency analysis and a method of tracking continuity of a frequency line according to a narrowband analysis condition will be described.

Referring to FIG. 1, in order to automatically track a frequency line in narrowband analysis, an operator sets a frequency to be tracked on a narrowband analysis (lowpass analysis, broadband analysis), and performs narrowband analysis A fixed or variable window cell size (range) is set according to the resolution, and then the maximum value of the spectrum is detected 101 within the window cell range.

Next, a logarithmic transformation (dB conversion) is performed on the two spectral values on both sides of the maximum value of the detected spectrum (102).

Next, the tracking validity of the frequency line is examined using the logarithmically transformed data. If the tracking validity is satisfied, the frequency line is continuously tracked. If the tracking validity is not satisfied, the tracking loss is treated as the tracking loss. A method for examining the traceability of the frequency line is shown in Equation (1).

Figure 112013119796618-pat00001

Here,? Is a weight value, T is a value for judging the presence or absence of a signal, and S represents a tracking validity value.

As shown in Equation 1, if the maximum value of the logarithmically transformed data is greater than noise + 3 dB, then 1 is assigned if the noise is larger than + 3 dB, 0 is assigned if the noise is smaller than or equal to 3 dB and multiplied by the weight to calculate the tracking feasibility value do. Thereafter, the above operation is repeated for each maximum number of detection times to accumulate tracking validity values. At this time, the weight (ω) gives a larger value to the recently detected maximum value (for example, ω 0 is larger than ω 5 ).

Therefore, if the accumulated tracking validity value (S) is greater than or equal to 0.5, the logarithmically transformed data is regarded as having passed the frequency line tracking feasibility, and if it is less than 0.5, it is regarded as loss. Here, the value less than 0.5 means that the signal of the target is weak and the frequency of the signal can not be distinguished from the noise or the surrounding frequency and can not be tracked.

If the traceability of the frequency line is satisfied, a three-point parabolic interpolation is performed on the two spectral values on both sides of the maximum value to keep track of the frequency line (104).

Next, the frequency value corresponding to the maximum value for the interpolated spectrum is re-detected (105). The re-detected frequency value is re-input to the frequency required for the maximum value detection (101) of the spectrum of the previous step (101).

2 shows a tracking method 200 according to an analysis frequency band conversion in an Overview Analysis.

Referring to FIG. 2, the present invention can perform a frequency line tracking linkage method when switching from a wide analysis frequency band (low resolution) to a narrow analysis frequency band (high resolution) in Overview Analysis.

The tracking link according to the analysis frequency band conversion tracks the frequency lines ①, ②, ③ and ④ in the wide analysis frequency band 201, and when it switches to the narrow analysis frequency band 202, But the tracking of the frequency lines ③ and ④ ends.

As another example, the present invention can perform a frequency line tracking association method when switching from a narrow analysis frequency band (high resolution) to a wide analysis frequency band (low resolution 4) in Overview Analysis.

The tracking link according to the analysis frequency band conversion tracks the frequency lines ① and ② in the narrow analysis frequency band 203 and then switches the frequency lines ① and ② to the same analysis window The signal to noise ratio (SNR) of two values is included in the window cell (i.e., when the window is set based on (1) as well as (2) ) Tracks high frequencies. If the SNR values of the two frequencies are the same, the lower frequency is first tracked. In the above, the SNR is calculated as the SNR average value of the last 6 frames.

FIG. 3 shows a tracking method 300 according to an analysis frequency band conversion in Magnifier Analysis.

Referring to FIG. 3, in an Overview Analysis (301), a frequency line (2) is tracked and a magnifier analysis (302) is performed to track new frequency lines (1) and (3) The tracking of the frequency lines 1 and 2 is performed in the lapping analysis 301 without performing the new extended lapping analysis 303. If the SNRs are included in the same window cell, Only trace large frequency lines.

Then, the frequency line ③ is continuously tracked in the new enlarged lobe analysis 303, and the tracking is not performed in the overview analysis 301. The frequency line ④ is newly set by the operator and the trace is performed in the expanded lap wave analysis.

In the following embodiment, while the frequency line ② is being tracked in the laparoscopic analysis 304, the extended laparoscopic analysis 305 is performed to track the frequency lines 1 and 2 including the new frequency line 1, When the frequency band is switched to the analysis band 306, the tracking of the frequency lines 1 and 2 is performed in the rope analysis 304 without performing the extended rope analysis 306. If the frequency lines ① and ② are included in the same window , Only the frequency line with a large SNR is tracked. In addition, the frequency line ③ is set by the operator to set a new trace in the enlarged lap analysis 306.

FIG. 4 shows a tracking method 400 according to the mutual conversion between the loaf analysis and the extended loaf analysis.

4, when the magnified wave analysis 402 and 403 are finished while the frequency lines ①, ②, ③, ④ and ⑤ are tracked in the magnified wave analysis 402 and 403, ③, ④, and ⑤ perform tracking in the laparoscopic analysis (401). If the tracking frequency line is adjacent to the same window cell as the frequency lines ① and ②, only the frequency line ② with high SNR is tracked.

In another embodiment, when the extended lobe analysis 405 and 406 are performed while the frequency lines 1, 2, 3, and 4 are tracked in the loaf analysis 404, the frequency line 1 , ②, ③, and ④ are not tracked in the rope analysis (404), but are automatically tracked in the rope analysis (405 and 406).

As described above, the present invention automatically tracks a frequency line of a signal obtained through a narrowband frequency analysis on a noise (signal) obtained from a sonar (sensor) and maintains the tracking continuity of the frequency line according to narrowband analysis conditions Monitoring of self noise is facilitated.

In addition, the tracked sonic noise frequency line information traced through the present invention provides basic information that can easily determine whether a signal detected in a specific sonar for detecting / tracking external noise is external noise or self noise, Detection is possible.

In the narrowband analysis according to the present invention described above, the configuration and method of the above-described embodiments are not limitedly applied. Instead, the embodiments can be applied to other methods, It will be understood that the invention can be practiced in a specific form. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive.

Claims (3)

Setting a tracking frequency of the target signal measured by the sensor and detecting a maximum value of the signal spectrum in a window cell range centered on the set tracking frequency;
Converting the peripheral frequency values including the detected maximum value into logarithmic conversion;
Determining the validity of the frequency line tracking for the logarithmically transformed data;
Interpolating data that passes the frequency line tracking feasibility; And
Detecting a frequency corresponding to a maximum value of the interpolated data and providing the detected frequency to the tracking frequency again. 2. The method of claim 1, wherein determining the validity of the frequency line tracing comprises:
Comparing the detected maximum value to noise + 3 dB;
Calculating a tracking feasibility value by assigning 1 if the detected maximum value is greater than or equal to noise + 3 dB;
Accumulating tracking validity values by repeating the comparing and calculating steps for the maximum number of detection times; And
And if the accumulated tracking validity value is greater than a predetermined value, considering that the logarithmically transformed data has passed the frequency line tracking validity. The method of claim 1, further comprising the step of performing a tracking linkage for guaranteeing continuity of frequency line tracing at mutual screen switching between a rope analysis for automatic frequency line tracing and an extended rope analysis in the narrowband analysis Automatic Tracking of Frequency Lines in Narrowband Analysis.
KR1020130165738A 2013-12-27 2013-12-27 Automatic frequency line tracking method at narrowband analysis KR101522204B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130165738A KR101522204B1 (en) 2013-12-27 2013-12-27 Automatic frequency line tracking method at narrowband analysis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130165738A KR101522204B1 (en) 2013-12-27 2013-12-27 Automatic frequency line tracking method at narrowband analysis

Publications (1)

Publication Number Publication Date
KR101522204B1 true KR101522204B1 (en) 2015-05-21

Family

ID=53395240

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020130165738A KR101522204B1 (en) 2013-12-27 2013-12-27 Automatic frequency line tracking method at narrowband analysis

Country Status (1)

Country Link
KR (1) KR101522204B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200015108A (en) * 2018-08-02 2020-02-12 국방과학연구소 Method for generating a synthesized lofar gram and apparatus therefor
KR102198951B1 (en) 2020-05-21 2021-01-05 국방과학연구소 Method and apparatus for identification of tonal signals in a sonargram
KR20210016839A (en) * 2019-08-05 2021-02-17 국방과학연구소 A compression device of a lofar or demon gram for detecting a narrowband of a passive sonar
KR20230014415A (en) * 2021-07-21 2023-01-30 국방과학연구소 Apparatus and method for robust automatic initiation of narrowband target tracking

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09145834A (en) * 1995-11-21 1997-06-06 Tech Res & Dev Inst Of Japan Def Agency Target signal detecting method and device
JP2965245B2 (en) * 1996-09-10 1999-10-18 防衛庁技術研究本部長 Mode eigenvalue measurement method
KR20100078558A (en) * 2008-12-30 2010-07-08 한국해양연구원 Method and apparatus for the front-end of the digital receiver for underwater acoustic communication
KR20120076313A (en) * 2010-12-29 2012-07-09 아틀라스 엘렉트로닉 게엠베하 Method for determining one or more relative directions as target direction or target directions and device for carrying out the method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09145834A (en) * 1995-11-21 1997-06-06 Tech Res & Dev Inst Of Japan Def Agency Target signal detecting method and device
JP2965245B2 (en) * 1996-09-10 1999-10-18 防衛庁技術研究本部長 Mode eigenvalue measurement method
KR20100078558A (en) * 2008-12-30 2010-07-08 한국해양연구원 Method and apparatus for the front-end of the digital receiver for underwater acoustic communication
KR20120076313A (en) * 2010-12-29 2012-07-09 아틀라스 엘렉트로닉 게엠베하 Method for determining one or more relative directions as target direction or target directions and device for carrying out the method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200015108A (en) * 2018-08-02 2020-02-12 국방과학연구소 Method for generating a synthesized lofar gram and apparatus therefor
KR102114311B1 (en) * 2018-08-02 2020-05-22 국방과학연구소 Method for generating a synthesized lofar gram and apparatus therefor
KR20210016839A (en) * 2019-08-05 2021-02-17 국방과학연구소 A compression device of a lofar or demon gram for detecting a narrowband of a passive sonar
KR102250835B1 (en) * 2019-08-05 2021-05-11 국방과학연구소 A compression device of a lofar or demon gram for detecting a narrowband of a passive sonar
KR102198951B1 (en) 2020-05-21 2021-01-05 국방과학연구소 Method and apparatus for identification of tonal signals in a sonargram
KR20230014415A (en) * 2021-07-21 2023-01-30 국방과학연구소 Apparatus and method for robust automatic initiation of narrowband target tracking
KR102497836B1 (en) 2021-07-21 2023-02-08 국방과학연구소 Apparatus and method for robust automatic initiation of narrowband target tracking

Similar Documents

Publication Publication Date Title
KR101522204B1 (en) Automatic frequency line tracking method at narrowband analysis
JP4845441B2 (en) Real-time power mask trigger generator
CN101464212B (en) Method and apparatus for vibration-based automatic condition monitoring of a wind turbine
US20080143316A1 (en) Signal analyzer and method for signal analysis
CN104457956A (en) Fundamental frequency identification method in cable force detection
CN102379694A (en) Electrocardiogram R wave detection method
CN105651376A (en) Mechanical equipment offline detection system vibration signal spectrum analysis and alarm method
JP6505348B1 (en) Radiation disturbance measurement method and radiation disturbance measurement system
CN117272210A (en) Method and system for detecting abnormal hidden danger data of building construction
US9970840B2 (en) Leak inspection device, leak inspection method, and leak inspection program
KR101294678B1 (en) Apparatus for processing signal
CN115539324A (en) Wind turbine generator set fault diagnosis method and device and electronic equipment
CN109596354B (en) Band-pass filtering method based on self-adaptive resonance frequency band identification
JP5606107B2 (en) Reference value creation device and reference value creation method
CN107368457B (en) The instantaneous Frequency Estimation method examined based on LoG operator and Grubbs
CN110333506B (en) Method for extracting inhaul cable position parameters of cable force measurement radar
CN106153363A (en) A kind of mechanical equipment fault automatic identifying method based on acoustic image monitoring
CN109474358A (en) For the power detection device of mobile communication, method, apparatus and storage medium
CN113188797A (en) Bearing fault diagnosis method based on microphone array
CN105959019B (en) Big bandwidth communication signal receiving analyzer based on binary channels Phase Stacking and method
KR101579896B1 (en) System and Method for Analyzing Cable State using Multi Band Signal
CN116961799A (en) Signal interference detection method based on time-frequency domain distribution characteristics
CN105445549B (en) A kind of weak electromagnetic signal frequency spectrum measuring method
KR101828918B1 (en) Method for analyzing spectrum adaptively and apparatus thereof
CN105491583B (en) A kind of interference detection method, base station, network element device and Interference Detection system

Legal Events

Date Code Title Description
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20190502

Year of fee payment: 5